Swaging machine



Jan. l26, 1943..

H.v G. ROBINSON swAGING MACHINE Filed July 17, 1940 INVENTOR 6. @05m/5m( Patented Jan. 26, 1943 Harry G. Robinson, Stratf ord, Conn., assignor to American Chain & Cable Company,l Inc., New

York, N. Y., a corporation of NewYork Application July 17, 1940, serial No. 345,880

4 claims. (o1. vs -fn) This invention relates to improvements in swaging machines and more particularly to improvements in dies used in such machines.

In operating swaging machines of the type in which a pair of opposed radially reciprocating v dies having cylindrical die faces are employed, it is found that the wedging action caused by the engagement of the dies with the humps on the work produced in the preceding closing operation 4of the dies, causes the dies to be camrned laterally in opposite directions intoV such tight frictional engagement with the walls of the guideway in the rotary die head as to prevent the vdies from. opening.

prevent such frictional jamming engagement be tween the die'svand their guideways by arranging the dies in offset relation with respect to each other or by so relieving certain portions of the faces of the dies as to prevent such camming ac-v i tion, the construction being preferably such that each of the dies will initially engage the work ,at two points substantially symmetrically with respect to an axial plane bisecting the dies.

Other objects of the invention will appear from the following description taken in connection with the drawing in which,

Fig. 1 shows a well known type of rotary swaging machine showing the swaging or die head and the hammer roll carrying, head in vertical diametral section; l

Fig. 2 is a face view of the swaging head, etc., shown in Fig. 1;

Fig. 3 shows one form of my invention; and

Fig. 4 shows another form of my invention.

The swaging machine disclosed in Figs. 1 and 2 is of the general type disclosed in the patent to Conner et al. 1,955,535, April 17, 1934. This machine includes an upwardly extending standard III in which is journalled a hollow shaft Il on a hammer roll head I2 which may be rotated by a belt I3 in a counterclockwise direction as viewed in Fig. 2. The swaging head I4 is provided with a shaft I5 journalled in the hollow shaft II and may be driven in a clockwise direction, as viewed in Fig. 2, by means of a belt I6. The swaging or die head I4 in this instance is provided with one diametrically extending guide groove in which operates a pair of dies 2I and 22 operated by hammer blocks 23 and 24 sliding in said guide groove and operated by hammer rolls 25 supported in a suitable carrier 26 which preferably has frictional engagement with the hammer roll carrying head I2. Insofar as the invention is concerned, the hammer roll carrying head I2 may It is therefore an object of this invention to be xed and non-rotatable. As the wedge or die carrying head I4 is rotated clockwise, the ham- Amer rolls 25 lroll over the hammer blocks 23 and 24 forcing the same and the dies 2! and 22 inwardly to operate on the work 30.

It has been found if the die faces 32'and 33 of the dies 2| and 22 are made truly cylindrical with respect to a common axis 35, when the dies are closed as represented by the solid lines indicating the central portions of the die faces and by the dotted lines indicating the front and rear ends or leading and trailing portions of the die faces, that the dies will stick on the workand will not release. For this purpose the front and rear ends or leading and trailingl portions of the die faces have been relieved or formed as arcs about non-coincidingaxes located on opposite sides of the axis 35. The front and rear ends or leading and trailing portions of the die faces 32 of the upper die 2I have been generated about an axis 36 located below the axis 35 and the front and rearends or leading and trailingr portions of the die faces 33 of the lower die 22 have been formed as surfaces generated about the axis 31. This prevents the dies from sticking on the work but as the ioperation of the dies on the work produces humps on the right and left sides of the work as considered with respect to Fig. 3, the leading portions of the die faces 32 and 33, if the dies 2I and 22 have been rotated clockwise with'respect to the work, will rst strike these humps which react to wedge the dies 2| and 22 respectively to the right and left into such tight frictional engagement with the walls of the guideway as to prevent their release by centrifugalaction.

In accordance with my invention I shape the trailing portions of the faces of the dies as described and provide the leading portions of the dies with faces generated about axes 35 and 31' so that the leading portions of the faces of the dies will be located a greater distance from the common axis of the central portions of the faces of the dies than in the described construction in which both the leading and trailing portions of the faces of the dies are similarly relieved. The positions of these axes are so chosen with respect to the amount of relative rotation between the dies and the work that the leading and trailing portions of the die faces will engage the cylindrical portion of the work and the hump of the Work at approximately the same time so that the camming action above referred caused by the engagement of the leading portions of the faces of the dies with the humps on the workV will be counterbalanced by engagement of trailing porttions of the die faces with portions of the work on opposite sides of an axial plane .bisecting the dies.

According to the construction disclosed in Fig. 4 the object of my invention may also be accomplished by taking dies of the usual construction but of greater radius, and cutting off a section of the leading end of each die as indicated at 40 and using shims 4I between the sides of the dies and the walls of the guideway in the rotary swaging head so as to offset the die faces with respect to each other in the direction indicated. When these dies are brought together upon the work the camming action producedby engagement of the dies with the humps' will beV counterbalanced by the cammingj actionf pro'- duced by other portions of the dies with cylindrical portions of the work on. the opposite. sides of the axial plane bisecting the dies.

It is understood of course that insofar as the invention is concerned that the rotary die or swagjng; head might be'Sta-tionary and the hammer roll carrying head rotatedl andi the work rotated withrespect to the dies. It is therefore my intention to employ expressions in the claims which cover such variations'` of constructions as it is obvious that relative rotation between the diesand .the work may be accomplished by either rotating the dies with respect' to, the work or the work with respect tothev dies.

WhileelA have described two different embodiments of my invention, it isunclerstood that I reserve the. right to all such other embodiments and changesasfall within the principles of the invention disclosedv andthe scope of the, appended claims.

I claim.:

l. In aswagingj machine comprising means for reciprocatingv dies 'radially upon work placed.V between the diesf and means for producing relative rotation between. the diesand the. work, opposed diesprovided with; substantially cylindrical die faces. oisehwithrespect to each other withrtheir leading portions at. greater distances l from`v the axis., of, relative. rotation. than:` their trailing,V portions, the. amount of,- relative vrotation `of, thefdies and; the ywork between successive reciprocations beingsuchthat', the leading. portions ofthe die faces engage those sections of the ,surface of the workY` which during the immediately preceding reciprocation of the dies lay in a plane passing between the dies and that the trailing portions of the die faces engage the work at approximately the same time.

"2. In a swaging machine comprising means for reciprocating dies radially upon work placed between the dies and means for producing a relative rotation of the dies and the work, opposed dies provided with substantially cylindrical die faces having their leading portions relieved to a greater extent than their trailing portions, the amount of relative rotation of the dies and the work between successive reciprocations being such that the leading and trailing portions of the die faces engage the work at approximately the LSametime and that the leading portions of the die faces engage those sections of the surface of the Work which during the immediately preceding reciprocation of the dies lay in a plane passing between the dies.

3; In ay swaging machine comprising means-for .reciproca-ting dies Yand for 'rotating theA dies about the work, opposedY diesprovided with substantially cylindrical die 'facesoffset with respect to each other with their leading portionsat a greater distance from the common axis of rotation of the dies than their trailing portions,` the amount of rotation of the dies betweensuccessive reciprocations being suchthat the leading portions ofthe die faces willrengage,thosesections of the surface of the work which during the immediately preceding reciprocation of the dies lay in a plane passing between the dies and that the trailing portions of the die faces engage the work at approximately thesame time.

4. In,` a swaging machiney comprising means for reciprocating dies and for rotating thedies about thework, opposed dies provided with. substantially cylindricaldie faceswiththeir leading portions. relieved. to` a. greater. extent than their trailing portions, theamount. of relative rotation ofthediesandthework between successive reciprocationsbeing suchthatthe leading andtrail ing portions. of the. die, faces. engage.. the work at. approximately the same. time and. that the leading portions of the. die, faces engage. those sections of the surface offthework whichduring the immediately preceding reciprocation.- ofi the dies lay in a plane passing betweenthe dies..

HARRY G, ROBINSON. 

